1
Marcus C Koepke, Jamie Krull, Jay R Machael, Tim Coffield, Keith L Davis, Amin K Habboub, Matthew J Phillips, Douglas A Schroeder, Craig H Schultz, Erik A Steffensen, Brian R Trego, Eric M Zillig: Ergonomic chair. HON Technology, Joseph H Golant, Jones Day, December 30, 2003: US06669292 (140 worldwide citation)

An ergonomic chair includes a four-bar linkage arrangement wherein a lower frame member is provided with a rigid front support and a rigid rear support with a seat member pivotably connected to the front support. A back rest has an upper support pivotably connected at an upper end of the rear suppor ...


2
Keith L Davis, Xiaoling Fang, Darrell Rose, Douglas M Chabries: Hearing aid fitting system. Sonic Innovations, D&apos Alessandro & Ritchie, March 13, 2001: US06201875 (51 worldwide citation)

A method for fitting a hearing compensation device comprises selecting a plurality of loudness levels for a plurality of frequencies and comparing each loudness level for each frequency for perceived sameness. The loudness levels may then be adjusted as needed to achieve perceived sameness across th ...


3
Carver A Mead, Douglas M Chabries, Keith L Davis: Digital hearing aid using differential signal representations. Sonic Innovations, D Alessandro & Ritchie, March 28, 2000: US06044162 (47 worldwide citation)

A hearing compensation system comprises an input transducer for converting acoustical information at an input thereof to electrical signals at an output thereof, a differential analog-to-digital converter sampling the electrical signals output from the input transducer at an input thereof and output ...


4
Keith L Davis, Marcus C Koepke, Jamie Krull, Jay R Machael, Matthew J Phillips, Douglas A Schroeder, Craig H Schultz, Erik A Steffensen, Brian R Trego, Eric M Zillig: Chair of modular construction. HON Technology, Jones Day, May 27, 2003: US06568760 (44 worldwide citation)

A chair of modular construction having modules that form the basic chair with additional modules that can be added to the chair without changing the basic construction thereof.


5
Robert S Green, Keith L Davis: Analog-to digital converter with delta-sigma modulator. Sonix Technologies, D Alessandro & Ritchie, May 25, 1999: US05907299 (40 worldwide citation)

An analog-to-digital converter according to the present invention comprising a comparator having first and second inputs, and an output, the comparator comparing an analog input voltage at the first input to a tracking voltage at the second input to place a digital output on the comparator output in ...


6
Keith L Davis, Xiaoling Fang, Darrell Rose, Douglas M Chabries: Hearing aid fitting system. Sonic Innovations, David B Ritchie, Thelen Reid & Priest, June 3, 2003: US06574342 (29 worldwide citation)

A method for fitting a hearing compensation device comprises selecting a plurality of loudness levels for a plurality of frequencies and comparing each loudness level for each frequency for perceived sameness. The loudness levels may then be adjusted as needed to achieve perceived sameness across th ...


7
Xiaoling Fang, Keith L Davis, Martin R Johnson: Method and apparatus for minimizing latency in digital signal processing systems. Sonic Innovations, Steven J Robbins, Thelen Reid & Priest, April 6, 2004: US06717537 (24 worldwide citation)

A method and an apparatus for minimizing latency in digital signal processing paths. One example is an active noise cancellation device. The system includes a digital closed feedback loop having a forward path and a feedback path. The forward path includes a compensation filter, a digital-to-analog ...


8
Richard W Harris, Keith L Davis: Switch responsive to an audio cue. Sonic Innovations, Richard W Harris, David B Ritchie, Thelen Reid & Priest, June 8, 2004: US06748089 (19 worldwide citation)

The present invention provides a switch method and apparatus that is switchable among a plurality of operational modes by attenuating an input audio signal detected by the apparatus. The apparatus includes a microphone which converts the input audio signal to an input electrical signal (IES), a firs ...


9
Keith L Davis, Matthew J Phillips, Rodney C Schoenfelder: Height and pivot-adjustable chair arm. Hon Technology, Joseph H Golant, Jones Day, March 9, 2004: US06702386 (14 worldwide citation)

A height and pivot-adjustable office chair arm assembly with an arm rest that can be raised to different vertical positions by actuation of a gas cylinder and having a shroud surrounding and vertically movable with respect to at least a portion of an arm support that is hollow and surrounds the gas ...


10
Keith L Davis: Chair control gas spring retainer for chair height reduction. Hon Technology, Jones Day Reavis & Pogue, March 13, 2001: US06199952 (11 worldwide citation)

A chair control mechanism for use with a single stage gas spring construction for chair height adjustability includes a main control housing having an upwardly directed opening and an upper control housing having a downwardly directed opening. The two housings are dimensioned and configured to nest ...